Property Due Diligence in Portugal: What Buyers Should Check Before Committing
The documents and registry checks that protect you before you sign in Portugal — a due diligence checklist from a Western Algarve agency.
BUYING IN THE ALGARVE
Bruna Rolph
10/2/20265 min read
Accurate as of September 2026. Registry practice and required documents can vary slightly by município, so confirm specifics with your own lawyer before relying on this as a final checklist.
Portugal doesn't publish a single official "buyer beware" checklist, so due diligence here means knowing which documents to ask for and what each one is actually telling you. Here's what we check, and what we tell every buyer to check, before any money changes hands.
What is property due diligence in Portugal, exactly?
It's the process of confirming that the property you're about to buy is legally what it appears to be — that the seller genuinely owns it free of undisclosed debt, that what's built matches what's registered, and that you can legally use it the way you intend to. In Portugal this isn't one document, it's four or five that need to be read together, because any one of them alone can look fine while still hiding a problem.
What's the single most important document to check?
The Certidão de Registo Predial (Land Registry Certificate, increasingly issued as a Certidão Permanente you can access online). This is the document that tells you who legally owns the property right now, and — critically — whether there's a mortgage, lien, seizure order, or other encumbrance (ónus ou encargos) registered against it. A seller can show you a beautiful property and a friendly smile; only this certificate tells you whether the bank has a claim on it that would need clearing before you could ever register your own ownership.
Does the tax record prove ownership?
No, and this trips people up. The Caderneta Predial Urbana is the tax register entry — it shows the property's official tax details (area, use, taxable value for IMI) but it does not confirm legal ownership or reveal debts. Sellers sometimes present only the Caderneta because it looks official and reassuring. Ask for both the Caderneta and the Certidão de Registo Predial, and check that the areas and description on each actually match each other — a mismatch is one of the more common early warning signs we see.
What does the Licença de Utilização actually confirm?
The Licença de Utilização (usage or habitation licence) confirms the local council has approved the building for the use it's being sold for — as a residential dwelling, specifically. Without it, you may be buying something the council doesn't formally recognise as a legal home, which can complicate everything from a future sale to getting utilities connected in your name. If a property was extended or converted after this licence was issued and the extension was never added to it, that gap is worth understanding before you commit, not after.
How do I check for unlicensed building work?
Compare the built area shown on the Caderneta Predial and the Licença de Utilização against what you can actually see on site. An extra bedroom, an enclosed terrace, a converted garage, or a guest annexe that doesn't appear on either document is a strong sign of obras não licenciadas (unlicensed construction). This doesn't automatically mean walk away — some of it can be legalised retroactively — but it does mean budgeting for that process and negotiating accordingly rather than discovering it after completion. Older properties carry this risk more often than new-builds, simply because extensions accumulate over decades — we'll have a dedicated guide on what to check specifically when buying an older property in Portugal soon, so keep an eye out for that.
What extra checks apply to an apartment?
If you're buying into a condominium, ask for a declaração de não dívida — a certificate from the condominium administration confirming the seller has no outstanding condo fees. Under Portuguese law, unpaid condo fees can follow the property rather than the person, so this single certificate protects you from inheriting someone else's arrears. It's also worth asking to see recent AGM (assembleia de condóminos) minutes, which often surface upcoming works or special assessments — a new roof or lift replacement being planned is something you'd rather know about at offer stage than after deeds.
Do I need to check boundaries and land registry area separately?
Yes, particularly for villas and anything with land, garden, or a pool. The area recorded on the registry doesn't always match the physical boundaries on the ground, especially on older rural or semi-rural plots that were never formally surveyed. A basic on-site check against the registered plan, or a formal boundary survey for anything with real land value attached, is cheap insurance against a dispute with a neighbour further down the line.
Who actually does all this checking?
You shouldn't be doing this alone, and we don't recommend it. An independent Portuguese lawyer — chosen by you, not suggested by the seller or the selling agent — is who formally requests and reviews these documents as part of representing your interests through to completion. If you haven't already, our guide on choosing a lawyer in Portugal covers what to ask before you sign a power of attorney. Several of the mistakes we see buyers make — relying on a seller's recommended lawyer, or skipping proper due diligence under time pressure — are covered in more detail in our guide to common mistakes international buyers make in the Algarve. We're also putting together a dedicated breakdown of exactly which documents your lawyer requests and why — keep an eye out for that one soon.
FAQ
What's the difference between the Caderneta Predial and the Certidão de Registo Predial? The Caderneta Predial is the tax authority's record of a property, used to calculate IMI — it does not confirm ownership or reveal debts. The Certidão de Registo Predial (or Certidão Permanente) is the land registry record, and it's the document that actually confirms current legal ownership and any mortgages, liens, or encumbrances registered against the property.
Can I buy a property in Portugal with unlicensed construction? Sometimes, yes — some unlicensed work can be legalised after the fact through the local câmara, depending on the município and the nature of the work. But it should be identified and budgeted for before you commit to a price, not discovered afterwards, since legalisation can involve its own costs, delays, and occasionally structural requirements.
What is a Licença de Utilização and why does it matter? It's the council's formal confirmation that a building is approved for the use it's being sold as, typically residential. Without it, or if the current layout doesn't match what the licence covers, you may face complications registering the property, connecting utilities, or reselling later.
Do I need a lawyer for due diligence, or can my estate agent handle it? You need an independent lawyer. A good estate agent will flag obvious issues and coordinate the process, but formally requesting and reviewing land registry, tax, and licensing documents — and confirming there's no debt or dispute attached to the property — is legal work, and it should be done by someone working solely for you, not for the seller.
How long does due diligence typically take before signing a CPCV? It varies with the property and how quickly documents come back from the registry and council, but a few weeks is typical for a straightforward resale property. Anything unusual in the paperwork — an unclear boundary, a missing usage licence, an estate still in probate — can extend that, which is exactly why starting due diligence early, rather than rushing to sign a promissory contract, matters.
